Gemini 4 Carbon now available to all

Simon Willison’s blog reports the release of llm-gemini 0.36, a plugin update tied to the availability of Google’s Gemini 4 Carbon model.

According to Willison’s post, Gemini 4 Carbon was first announced two weeks prior, on Google’s blog, as a model intended for “a subset of cyber defenders.” Google’s announcement at that time restricted access to this specialized group.

Willison notes that Google has now published a follow-up post stating the model is available to everyone else. The llm-gemini 0.36 release coincides with this wider rollout, extending plugin support to the newly opened model.

The original announcement and the expansion notice both originate from Google’s own blog, under its “Innovation and AI” and “Models and Research” sections, with the Gemini model line as the subject. Willison’s post functions as a bridge between the two official Google statements, tracking the plugin ecosystem’s response to the model’s broadened availability.

No further technical specification of Gemini 4 Carbon’s capabilities is given in the cited material beyond its initial restriction and subsequent general release. The release notes for llm-gemini 0.36 are linked directly to the GitHub repository maintained by Willison, dated November 10, 2026.